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Friction Practice Problems

This document provides 7 practice problems involving friction. The problems cover calculating coefficients of kinetic friction, accelerations, and maximum incline angles for static friction. The problems involve boxes being pulled or sliding on surfaces, as well as a car braking. The answers to the 7 problems are provided at the end.

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raghava penumudi
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584 views1 page

Friction Practice Problems

This document provides 7 practice problems involving friction. The problems cover calculating coefficients of kinetic friction, accelerations, and maximum incline angles for static friction. The problems involve boxes being pulled or sliding on surfaces, as well as a car braking. The answers to the 7 problems are provided at the end.

Uploaded by

raghava penumudi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Friction

 Practice  Problems:  Solve  on  separate  lined  paper  


 
fs ≤ µsN     fk = µk N  
 
 

 
 
1)     A  12.0  kg  box  is  being  pulled  along  level  ground  at  constant  velocity  by  a  horizontal  force  of  38.0  N.  
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What  is  the  coefficient  of  kinetic  friction  between  the  box  and  the  floor?  
 
2)     The  horizontal  pulling  force  on  the  box  in  the  above  problem  is  increased  to  55.0  N.  What  is  the  box’s  
acceleration?  
 
3)     A  car  driving  on  level  ground  at  20.0  m/s  slams  on  its  brakes  and  skids  to  a  halt.  If  the  coefficient  of  
kinetic  friction  between  the  car’s  tires  and  the  road  is  0.750,  how  far  does  the  car  skid  before  
stopping?  How  far  would  the  car  have  skidded  if  it  had  been  moving  at  40.0  m/s?  
 
 
  20   o

 
 
4)   A  15.0  kg  box  is  being  pulled  along  level  ground  by  a  75.0  N  force  that  is  directed  at  an  angle  of  20o  
above  the  horizontal.  The  coefficient  of  kinetic  friction  is  0.330.  What  is  the  acceleration  of  the  box?  
 
5)     A  5.00  kg  box  is  being  pulled  at  constant  speed  up  a  30o  incline  by  a  force  of  45.0  N  parallel  to  the    
incline.  Determine  the  coefficient  of  kinetic  friction  between  the  box  and  the  plane.  
 
6)     If  the  coefficient  of  static  friction  between  your  sneakers  and  the  ground  is  0.800,  what  is  the  largest  
angle  incline  you  could  stand  on  without  slipping?    
 
7)   A  box  slides  down  a  45o  incline  with  an  acceleration  of  1.24  m/s2  down  the  incline.  What  is  the  
coefficient  of  kinetic  friction  between  the  block  and  the  incline?  
 
   
 
 
 
 
 
 
 
 
 
Answers:  1)  0.323;  2)  1.43  m/s2;  3)  27.2  m;  109  m;  4)  2.03  m/s2;  5)  0.483;  6)  38.7o;  7)  0.821    
 

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